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Microbial Lactam Biosynthesis and Biosensing by Jingwei Zhang a Dissertation Submitted in Partial Satisfaction of the Requiremen

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Microbial Lactam Biosynthesis and Biosensing by Jingwei Zhang a Dissertation Submitted in Partial Satisfaction of the Requiremen Microbial Lactam Biosynthesis and Biosensing by Jingwei Zhang A dissertation submitted in partial satisfaction of the requirements for the degree of Joint Doctor of Philosophy with University of California, San Francisco in Bioengineering in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Jay Keasling, Chair Professor John Dueber Professor Shawn Douglas Professor Wenjun Zhang Fall 2015 Microbial Lactam Biosynthesis and Biosensing Copyright 2015 by Jingwei Zhang Abstract Microbial Lactam Biosynthesis and Biosensing by Jingwei Zhang Joint Doctor of Philosophy with University of California, San Francisco in Bioengineering University of California, Berkeley Professor Jay D. Keasling, Chair Lactam is an important class of commodity chemicals used in the manufacture of nylons, with millions of tons of production every year. 2-Pyrrolidone is a valuable bulk chemical with myriad applications as a solvent, polymer precursor and active pharmaceutical intermediate. A novel 2-pyrrolidone synthase, ORF27, from Streptomyces aizunensis was identified to catalyze the ring closing dehydration of γ- aminobutyrate. ORF27’s tendency to aggregate was resolved by expression at low temperature and fusion to the maltose binding protein (MBP). Recombinant Escherichia coli was metabolically engineered for the production of 2-pyrrolidone from glutamate by expressing both the genes encoding GadB, a glutamate decarboxylase, and ORF27. Incorporation of a GadB mutant lacking H465 and T466, GadB_ΔHT, improved the efficiency of one-pot 2-pyrrolidone biosynthesis in vivo. When the recombinant E. coli strain expressing the E. coli GadB_ΔHT mutant and the ORF27-MBP fusion was cultured in ZYM-5052 medium containing 9 g/L of L- glutamate, 7.7 g/L of L-glutamate was converted to 1.1 g/L of 2-pyrrolidone within 31 h, achieving 25% molar yield from the consumed substrate. -caprolactam and -valerolactam are important commodity chemicals used in the manufacture of nylons, with millions of tons produced every year. Biological production of these high valued chemicals has not been possible due to a lack of enzymes that will cyclize the ω-amino fatty acid precursors to the corresponding lactams under ambient conditions. In this study, we demonstrated proof of these bioconversions by in vitro enzyme assays. We found that ORF27, an enzyme involved in the biosynthesis of ECO-02301 in Streptomyces aizunensis, has a broad substrate spectrum and can not only cyclize γ-aminobutyric acid into butyrolactam, but also 5- aminovaleric acid (5-AVA) into -valerolactam and 6-aminohexanoic acid (6-AHA) into - caprolactam. The ORF27 lactam formation reaction was characterized by product analysis, and ORF27’s activity on the three ω-amino fatty acids were compared. Recombinant E. coli expressing ORF27 produced valerolactam and caprolactam when 5-AVA and 5-AHA, respectively, were added to the culture medium. Upon co-expressing ORF27 with a metabolic pathway that produced 5-aminovaleric acid from lysine, we were able to demonstrate production of -valerolactam from lysine or directly from glucose. Biological production of -caprolactam, -valerolactam and butyrolactam were enabled by the recent discovery of lactam synthases that cyclize their ω-amino fatty acid precursors to the corresponding lactams. To facilitate strain optimization with regard to product yields, productivities, and titers, it is desirable to develop a high throughput screening system for 1 specific small-molecule detection and response. We took the chemical informatics concepts used in small molecule drug discovery, and adapted them into a metabolic engineering strategy for targeted scouting of protein sensor candidates, named “Analog Generation towards Catabolizable Chemicals”. We discovered a lactam biosensor based on the ChnR/Pb transcription factor- promoter pair. The microbial biosensor was engineered to be a single plasmid system, demonstrating dose dependent response for -caprolactam, -valerolactam and butyrolactam with great dynamic range (1.8-3.5) and wide linear range of 1-2 orders of magnitude. The biosensor also showed specificity against intermediates of lactam biosynthetic pathways and therefore could potentially be applied for high throughput metabolic engineering for industrially important lactam biosynthesis. 2 This dissertation is dedicated to my father, who for the first 18 years of my life, devoted the majority of his efforts to cultivate me and teach me to be a good person. I know he would have been very proud to see this work come to completion. i Acknowledgement I have had a great experience in graduate school because of the people I encountered, to whom I am truly grateful for their help, advice, support and friendship. None of this would have been possible without the support of my advisor and mentor, Jay Keasling. I have been very lucky to work in a lab where the advisor is supportive of wherever my imagination and passion took me. In retrospect, you have always been encouraging me to come up with my own ideas and take risks, while silently guarded me away from the futile paths. I deeply appreciate and cherish your kind protection of my passion for creativity, especially during the early days of my graduate school, when my scientific training had not allowed me to differentiate between a wild yet feasible idea vs. an impossible idea. I can never imagine a mentor as open-minded and tolerant as you are: In additional to my research, you allowed me to mentor undergraduate students, allowed me to gain entrepreneurship experience via a part time internship at the Lawrence Berkeley National Lab tech transfer office. You also supported me to conduct some business development for my thesis project, which landed in a joint collaboration between our lab and a biotechnology company. I joined the Keasling Lab with minimal molecular or microbial biology experience. My first work lead, Clem Fortman, who both taught me all the techniques to get me started. Clem, you are influential to me not only for the scientific thinking, but also entrepreneurial spirit and caring for family. My passion for startup was greatly shaped by your perspectives. I wish to thank other Keasling lab rooted members who went onto industry/startup endeavors, your spirit also gave me a lot of power when I look forward. Eric Steen, Mario Oullette, Eric Luning, Nathan Hillson, Jeffery Dietrich, Matt Mattozzi, Howard Chou and Leonard Katz. During my qualify exam, Satoshi Yuzawa, Josh Gilmore, Nathan Hillson, Greg Bokinsky, Jim Kirby, Eric Luning, Tristan de Rond, Andrew Hagen, Naoki Chiba, Sean Poust, Edward Baidoo, Chris Petzold, William Holtz, Fuzhong Zhang and Ryan Phelan offered significant advice to my thesis proposal and shaped my scientific thinking. My research was greatly helped by members of the polyketide synthase minigroup in the Keasling lab. I owe a lot to Satoshi Yuzawa, Olga Sekurova, Sergey Zotchev, Woncheol Kim, Andrew Hagen, Leonard Katz, Naoki Chiba, Sean Poust, Bob Haushalter, Anna lechner, Peter Kelly, Clara Eng and Ryan Phelan. You have spent a lot of time discussing every aspect of my project with me, from the goal, to experimental design, to data and to publication. Some people I have worked side by side with, Veronica Fok, Edward Baidoo, George Wang, Chijioke Joshua, Ouwei Wang, Suzan Yilmaz, Freeman Lan, Tuan Tran, Harry Beller, Taek Soon Lee and Ryan McAndrew. I would like to thank Dr. Bo Chen, from China National Cereals, Oils and Foodstuffs Corporation (COFCO). Thank you for putting faith in my project and established the collaborative project. I gained a great deal of insight into how biotechnology companies view R&D. I was lucky to have worked with a group of talented and enthusiastic undergraduate students: Sandra Diaz, Anirudh Sapru, Matt Chen, Emily Kao, Bryton Dias, Kenny Hsu, Mehmet Burdu. ii To Bill Shelander, your perspective on technology commercialization and entrepreneurship will inspire and influence me for many years to come. I love my families. To my wife, Yue Liu, having your accompany during graduate school was the best thing that happened to me. I am grateful for all your sacrifices; for your bringing two lovely children to our family; for spending your precious five years staying with me, far away from your home, your family and friends. To my parents, and the family on my wife’s side, thank you for your support and guidance for my pursuing my PhD, alleviating a lot of the life’s burdens so that I could concentrate on my study. To my grandma on my father’s side, I am about to complete an important milestone you assigned to me during my childhood. Thank you for teaching me all the important lessons in life, they have been giving me courage whenever I encounter difficulties. I wish you enjoy a healthy and happy life. To my grandparents on my mum’s side, I wish you peaceful up there in heaven. Now I am about to obtain my PhD in bioengineering. I hope I make you proud. Thank you for reading and commenting on my dissertation draft. iii Jingwei Zhang Curriculum Vitae Email: [email protected] Education: Univ. of California, Berkeley 2010-present Ph.D. candidate in Joint Graduate Group in Bioengineering University of California, Berkeley - Walter A. Haas School of Business Certificate, Management of Technology Univ. of California, Berkeley, 2008-2010, B.S., Chemical Biology Univ. of California, Los Angeles, 2007-2008, Chemistry and Biochemistry The University of Hong Kong, 2006-2007, Biochemistry Tsinghua University, 2005-2006, Chemical Engineering
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